I feel that in usage, lyrical is the 'soft jazz' that is always done to sad, angsty, nostalgic or sweet songs. In usage, 'contemporary' usually means 'modern jazz' or 'new jazz' that is done to more of a variety of music.
The greatest integer function of a real number x is represented by f(x) = [x] or |_x_|. For all real numbers x, the greatest integer function returns the largest integer less than or equal to x. In other words, the greatest integer function rounds down a real number to the nearest integer.
Greatest common divisor. In mathematics, the greatest common divisor (gcd) of two or more integers, when at least one of them is not zero, is the largest positive integer that divides the numbers without a remainder. For example, the GCD of 8 and 12 is 4. The greatest common divisor is also known as the greatest common factor (gcf), highest common factor (hcf), greatest common measure (gcm), or highest common divisor. This notion can be extended to polynomials (see Polynomial greatest common divisor) and other commutative rings (see below).